Hydraulic-press accelerator.



G. A. ENSIGN & J. C. M. DES ISLETSV HYDRAULIC PRESS ACCELERATOR-APPLICATION FILED JUNJZ 12. m1.

1' ,25 6,451 Patented Feb. 12, 1918.

' WITIIESSES I /wqvm/rs v I386 3 zkfiyze. @2145 868 Y W v Arm/mm G. A.ENSIGN & J. C. M. DES ISLETS.

HYDRAULIC PRESS ACCELERATOR.

APPLICATIQN mp0 JUNE 12. 1911.

1,256,451. Patented Feb. 121918;.

a SHEETS-SHEEI 2.

A TTORN'EYS .WI-TNESSES fl WENT? I B) M z fi r wa" 22 M cJFCIMDe;Isl-sis ATTORNEYS G. A. ENSIGN & l. C. M. DES ISLETS.

HYDRAULIC PRESS ACCELERATOR.

APPLICATION FILED IUNE I2. 1917. 1,256,451. Patented Feb. 12,1918.

WITNESSES UNITED STATES PATENT OFFICE.

GEORGE A. ENSIGN AND JOHN C. M. DES ISLETS, OF DEFIANCE, OHIO, ASSIGNORSTO DEFIANGE MACHINE WORKS, 0F DEFIANCE, OHIO, A-CORPORA'IION OF OHIO.

HYDRAULIC-PRESS ACCELERATOR.

Specification of Letters Patent.

Patented Feb. 12, 1918.

Application filed .Tune 12, 1917. Serial No. 174,227.

' following is a full, clear, and exact description.

The invention relates to hydraulic presses such, for instance, as shownand described in the Letters Patent of the United States, No. 728,628,granted to Charles Seymour, on May 19, 1903.

The object of the invention is to provide a new and improved hydraulicpress. accelerator arranged to increase the output of the hydraulicpress by providing a rapid advance of the hydraulic press piston towardthe work until the compression stage is reached, by subsequentlyadvancing the saidpistonv under the direct full pressure of the pumpuntil the desired compression is reached, and by finally returning thepiston speedily to normal inactive or starting position. Another objectis to cushion the hydraulic press piston durlng the last stage of itsreturn movement. Another object is to enable the attendant of thehydraulic press to control the moveffmjent of the'piston by the simplemanipulationfof a single operating lever.

In order to accomplish the desired result, use is made of airacceleratordirecting an amount ofliquid against the piston of, the hydraulic press.in excess of that pumped'by theffjpump to quickly move the piston duringthe period of its initial stroke. 2 A practical embodiment of theinvention is represented in the accompanying drawings forming a part ofthis specification, in which similar characters of reference indicatecorresponding parts in all'the views.

Figure 1 is a plan view of the accelerator as-applied to the hydraulicpress, parts of which are shown "in'section;

Fig. 2 is a side elevation of the same;

, Fig. 3 is'an enlarged sectional side ele vation'of the cylinder andpiston of the accelerator Fig. 4 is an enlarged sectional-side elevation of the manually controlled valve for -ton 21 in its cylinder 20,the

controlling the fiow of ,the liquid from the pump to the accelerator tothe hydraulic press cylinder and from the latter back to the a celeratorand pump;

Fig. 5 is a sectional plan view of the same on the line 55.of Fig. 4:;

Fig. 6 is a similar view of the same on the line 66 of Fig. 4-;

Fig. 7 is a similar view of the same on the line 77 of Fig. 4;

Fig. 8 is a diagrammatic view of the hy drauhc press and the acceleratorwith the parts 1n starting position to rapidly advance the piston in thehydraulic press cylinder;

Fig. 9 is a. similar view of the same with the parts'in position duringthe compression perlod; and

Fig. 10 is a similar view of the same with the parts in correspondingposition for the return of the hydraulic press piston.

In hydrauhc presses of the type referred to and in which considerablemovement is given to the piston prior to the latter reachoutput is themain object of the accelerator presently to be described in detail.

In the cylinder 20 of the hydraulic press reclprocates a piston 21, anda pump 22 arranged within a casing 23 is used to pump oil or otherliquid into the lower end of the cylinder 20 to raise the piston 21therein. Adjacent the casing 23 is arranged. an accelerator cylinder 25provided with two bores 26 and 27 in which reciprocate the pistons 28and 29. Durin the initial upward movement of the hyc raulic resspisliquid is pumped by wayof the accelerator to the cylinder 20, andduring the compression stage the liquid is pumped directly by the pump.22 into the cylinder 20. For this purpose use is made of a triple valveprovided with a valve body 32 in which 1s mounted to turn'a triple valveplug 33 provided on the outer end of its stem 34 with a handle 35 underthe control of the operator for turning the valve plug 33, ashereinafter more fully described. The valve body 32 is provided in itsupper pprtlon with channels 36, 37 and 38 disposed in the samehorizontal plane and oi which the outer end of the channel 36 isconnected by a pi e 39 with the pump 22. The outer end of t e channel 37is connected by a pipe 40 with the bottom of the hydraulic presscylinder 20. The channel 38 is connected by a pipe 41 with a passage 42leading to the bpttom of the bore 27 of the accelerator cyl1nder 25. Thevalve plug 33 is provided in its upper portion with a three-way port 43to connect the channel 36 with the channel 38 (see Fig. 8) and to closethe channels 36 and 38 to the channel 37 to force the liquid pumped bythe pump into the lower end of the small bore 27 of theacceleratorcylinder 25 with a view to raise the pistons 29 and 28 therein. Then thevalve plug 33 is turned into the position shown in Fig. 9 then thechannel38 is closed and the channels 36 and 3.7 are connected with eachother to direct the liquid pumped by the pump 22 directly into thehydraulic press cylinder 20 to utilize the pressure of the pump directduring, the ,final or compression sta e. When the valve plug 33 isturned into tie position shown in Fig. 10 then the channels 37 and 38are connected with each other while the channel 36 is closed,

The valve body 32 is further provided with channels 50, 51 and 52disposed in the same horizontal plane parallel with the plane in whichthe channels 36, 37 and 38 are located. The channels 50 and 51 areconnected by pipes 53 and 54 with the upper portion of the bore 26 ofthe accelerator cylinder 25. The channel 52 is connected by a branchchannel 55 with the channel 37, as plainly shown in'Fig. 4. The valveplug ,33is" providedwith a three-way port 56 and when the valvel lug isin the posltion shown in Fig. 8then t e channelfil is closed whilethec-hannels 50 and 52 are connected with each other to allow the liquidon top of the piston 28 in'the bore 26 of the accelerator wayof thebranch channel 55 and-the p1pe 40 into the lower end of the hydraulicpress cylinder 20.

When the valve plug 33 is turned into the position shown in Fig. 9 thenthe channel 52 is closed and the channels 50 and 51 are connectedwitheach other and the accelerator cylinder 25 is cutoff from thehydraulic press cylinder 20. When the valve plug 33 is turned into theposition shown in Fig. 10

then the channels 50, 51 and 52 are connected with each other to allowthe liquidto flow nected by a vent pipe 65 with the bottom of the largebore 26 of the accelerator piston 25. When the valve plug 33 is in theposition shown in Figs. 8 and 9 then both channels 60 and 61 aredisconnected from each other, but when the valve plug is turned into theposition shown in Fig. 10 then the said channels 60 and 61 are bothconnected with each other to connect the top of the bore 26 of theaccelerator cylinder 25 with the pump casing 23. The pipes 63, 64 and 65are comparatively small relative to the other pipes previouslymentioned. It is understod that the several pipes, channels, ports andthe accelerator cylinder 25 are filled with oil or other liquid.

The operation is as follows:

When the pump 22 is running and the hydraulic press piston 21 and theaccelerator pistons 28, 29 are in lowermost positions, and the valveplug 33 is turned into the position shown in Figs. 4, 5, 6, 7 and 8,,then the liquid pumped by the pump 22 passes by way of the pipe 39,channel 36, port 43. channel 38, pipe 41 and channel 42 into the lowerend of the small bore 27 of the cylinder 25 thus exerting an upwardpressure against the small piston 29 to raise the latter and the largepiston 28 thereby displacing the liquid contained in the upper portionof the bore 26 of the accelerator cylinder 25. The liquid passes out ofthe upper end of the bore 26 of the cylinder 25 by way of the pipe 53,the channel 50, the port 56, channels 52, 55 and 37, and pipe 40 intothe lower end of the hydraulic press cylinder 20 to raise the pisten 21therein. It will noticed that the accelerator piston 28 in risingdisplaces a larger amount of liquid in comparison to the amount ofliquid passing into the bore 27 from the pump 22 and hence acorrespondiugly large amount of liquid is forced into the hydraulicpress cylinder 20 to quickly raise the piston 21 therein. When thepiston 21 reaches-the compressionstag'e. and is in contact with the workthen the operator turns the valveplug 33 frcmothe position shown inFigs. 4,5, 6, 7 and 8 into the positionshown in Fig. 9. l/Vhen thistakes place the accelerator cylinder 25 is practically cut out and thepump 22 is directly connected withthe hydraulic press cylinder 20 by wayof the pipe 39, channel 36, port 43, channel 37 and pipe 40. Thus duringthe compression perlod the high pressure of the pump is directlyutilized on the piston 21 of the hydraulic press. I

After the end of the compression stage has been reached, the operatorturns the valve plug 33 into the position shown in Fig. 10 to cut outthe pump relative'to the hydraulic press cylinder 20. The liquidcontained in the hydraulic press cylinder 20 now flows by its owngravity and the weight of-the piston 21 by way ofthe pipe 40, channels37, 55 and 52 into and through the port 56 connected with both channels50 and 51 which by their pipes 53 and 54 are connected with the upperend of the bore 26 of the accelerator cylinder 25, the lower end ofwhich is connected by the vent pipe 65 with the pump casing 23. 'l'hepistons 28 and 29 are now forced downward by the liquid flowing into thetop of the bore 26 of the accelerator cylinder 25, and the liquid in thebottom of the bore 27 ot the accelerator cylinder 25 passes by way ofthe passage 42, pipe 41, channel 38. port 43 and channel 37 into thechannel 55 to return to the top of the bore 26 with the liquid from thecylinder 20. The hydraulic press cylinder 20 is thus quickly relieved ofthe liquid and the piston 21 therein descends rapidly but is cushionedbefore reaching the end of its downward stroke. This takes place aboutthe time the accelerator pistons 28, 29 reach the end of their downwardmovement. The liquid still coming into the upper end of the bore 26 ofthe accelerator cylinder 25 now passes by way of the pipe 63, thechannel 60, port 62, channel 61 and pipe 64- into the pump casing 23,but as the outflow of the liquid is from the upper end of the bore 26 ofthe accelerator cylinder 25 through the small pipe 63, it is evidentthat the outflow of the liquid from the hydraulic press cylinder 20 ischecked and the piston 21 is cushioned immediately prior to reaching theend of its downward movement.

It will be noticed that the accelerator piston 28 in rising displaces alarger amount of liquid incomparison with the amount of liquid passinginto the bore 27 from the pump 22 and hence a correspondingly largeamount of liquid is forced into the hydraulic press cylinder 20 toquickly raise the piston 21 therein. i

It is understood that on starting the hydraulic press very little poweris required to laise the dead weight of the piston 21 until the work isreached, and by forcing a large amount of liquid from the bore 26 of theaccelerator cylinder 25 into the hydraulic press cylinder 20 under lowpressure the pision 21 is quickly raised. During the compression periodthe accelerator is cut out and the high pressure of the pump is directlyused.

The initial ,return movement of the hyd 'aulic press piston 21 isaccelerated as both pipes 53 and 54 are now connected with the upper endof the bore 26 to quickly fill the said bore and force the istons 28 and29 downward. When the piston 28 is seated the piston 21 is at the laststage of its downward movement and is cushioned owing to the return flowof the liquid from the bore 26 to the casing 23 by way of the small pipe63 and valve connections above described.

From the foregoing it will be seen that the attendant in charge of thehydraulic press by simply manipulating handle 35 of the valve plug 33can readily control the flow of the liquid from the pump 22, first tothe small bore 27 of the accelerator cylinder and then direct to thehydraulic press cylinder 20, and when the end of the compression periodhas been reached the attendant gives a further turning of the valve plug33 to direct the flow of the liquid from the hydraulic press cylinder 20to the accelerator cylinder 25 to refill the bore 26 and to eventuallycheck or cushion the descent or" the piston 21 and to return to thecasing 23 th amount of the liquid pumped out of it by the pump 9 duringthe raising of 1111213151201]. 21 of the hydraulic press.

Having thus described our invention, we claim as new and desire tosecure by Let ters Patent- 1. In a hydraulic press, a cylinder, a piston reciprocating in the said cylinder, 2. pump connected with the saidcylinder to force a liquid into the cylinder, and an accelerator in theconnection between the pump and the said cylinder and having a two-borecylinder and a double piston reciprocating therein, the smaller pistonbeing adapted to be actuated by pressure from the said pump and thelarger plston forcing a larger amount of liquid into the hydraulic presscylinder than is used by the said pump to actuate the smaller piston,and a single manually con trolled valve connected with the said pump,

the hydraulic press cylinder and the bores of the accelerator cylinderto control the flow of the iiquid from the pump to the small bore of theaccelerator cylinder, to subsequently control the flow of the liquiddirect from the pump to the hydraulic press cylinder, and tosubsequently control the return flow of the liquid from the hydraulicpress cylinder to both the pump and the large bore of the acceleratorcylinder.

2. In combination, a hydraulic press cyl inder, a piston reciprocatingtherein, a pump, an accelerator having a cyli der pro vided with twobores, a double ciprocating therein, connections bet'a'eenthe said pump,the said hydraulic press cylinder and the said accelerator cylinder, asingle manually controlled valve in the said connections to control theflow of the liquid from the pump to the small bore of the saidaccelerator cylinder and subsequently direct to the said hydraulic presscylinder, and from the said hydraulic press cylinder to the large boreof the said accelerator cylinder and the pump.

3. In a hydraulic press, a cylinder, a piston reciprocating therein, apump having a casing, an accelerator cylinder having a large and a smallbore, a double piston re ciprocating in the said bores, and a valvehaving a manually controlled valve plug, the said valve being connectedwith the said pump, the said hydraulic press cylinder the said large andsmall bores of the accelerator cylinder and the said pump casing.

4. In a hydraulic press, a cylinder, a piston reciprocating therein, apump havlng a casing, an accelerator cylinder having a large and a smallbore, a double piston reciprocating in the said bores, and a valvehaving a manually controlled valve plug, the

said valve being connected with the said pump, the said hydraulic presscylinder, the said large and small bores of the accelerator cylinder andthe said pump casing, the said valve in one position controlling theflow of the liquid pumped by the pump to the small bore of theaccelerator cylinder, the said valve in another position directing theflow of the liquid pumped by the pump direct into the hydraulic presscylinder, and the said valve in a third position controlling the outflowof the liquid from the hydraulic press cylinder back into the larg boreof the accelerator cylinder, checking this return flow to cushion thehydraulic press piston and to refill the pump casing with liquid fromthe large bore of the accelerator cylinder.

GEORGE A. EN SIGN. JOHN C. M. DES ISLETS.

